Dataset Direct Download Service (WFS): N_ZONE_ALEA_PPRN_20140413_S_032

The mapping of the hay removal of clays in the commune of Cazaubon in the Gers department is extracted from the departmental mapping from the BRGM. This mapping is a zoning of the probability of occurrence of the phenomenon of shrink-inflating of clay soils. A susceptibility map was first drawn up on the basis of purely physical criteria by the BRGM from the geological maps of the department, which were interpreted taking into account the following factors for each geological formation: — the proportion of clay material within the formation (lithic analysis); — the proportion of blowing minerals in the clay phase (mineralogical composition); — the geotechnical behavior of the material. For each of the clay formations identified, the hazard level is ultimately the result of the level of susceptibility thus obtained with the density of sinister swelling, reported to 100 km² of actual urbanised outcropping surface.该热尔省（Gers）卡佐邦市镇内黏土胀缩现象的绘图源自法国地质矿业研究局（BRGM）的省级绘图成果。该绘图为黏土土壤胀缩现象发生概率的分区图。法国地质矿业研究局（BRGM）首先基于纯物理准则，以该省的地质图为基础编制了易发性分区图，编制过程中针对每个地质单元综合考量了以下因素： —— 地质单元内黏土物质的占比（岩相分析）； —— 黏土相中易风化物的占比（矿物组成）； —— 该物质的岩土工程特性。 针对每一个已识别的黏土层，最终的灾害等级由上述易发性等级结合灾害性胀缩的发生密度确定，该密度以每100平方千米实际出露的城市化地表面积为基准进行折算。